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42 #ifndef QDECLARATIVEGUARD_P_H
43 #define QDECLARATIVEGUARD_P_H
49 // This file is not part of the Qt API. It exists for the convenience
50 // of qapplication_*.cpp, qwidget*.cpp and qfiledialog.cpp. This header
51 // file may change from version to version without notice, or even be removed.
56 #include <QtCore/qglobal.h>
57 #include <QtCore/qvariant.h>
58 #include <private/qdeclarativedata_p.h>
62 class QDeclarativeGuardImpl
65 inline QDeclarativeGuardImpl();
66 inline QDeclarativeGuardImpl(QObject *);
67 inline QDeclarativeGuardImpl(const QDeclarativeGuardImpl &);
68 inline ~QDeclarativeGuardImpl();
71 QDeclarativeGuardImpl *next;
72 QDeclarativeGuardImpl **prev;
74 inline void addGuard();
75 inline void remGuard();
80 class QDeclarativeGuard : private QDeclarativeGuardImpl
82 friend class QDeclarativeData;
84 inline QDeclarativeGuard();
85 inline QDeclarativeGuard(T *);
86 inline QDeclarativeGuard(const QDeclarativeGuard<T> &);
87 inline virtual ~QDeclarativeGuard();
89 inline QDeclarativeGuard<T> &operator=(const QDeclarativeGuard<T> &o);
90 inline QDeclarativeGuard<T> &operator=(T *);
92 inline T *object() const;
93 inline void setObject(T *g);
95 inline bool isNull() const
98 inline T* operator->() const
99 { return static_cast<T*>(const_cast<QObject*>(o)); }
100 inline T& operator*() const
101 { return *static_cast<T*>(const_cast<QObject*>(o)); }
102 inline operator T*() const
103 { return static_cast<T*>(const_cast<QObject*>(o)); }
104 inline T* data() const
105 { return static_cast<T*>(const_cast<QObject*>(o)); }
108 virtual void objectDestroyed(T *) {}
113 Q_DECLARE_METATYPE(QDeclarativeGuard<QObject>)
117 QDeclarativeGuardImpl::QDeclarativeGuardImpl()
118 : o(0), next(0), prev(0)
122 QDeclarativeGuardImpl::QDeclarativeGuardImpl(QObject *g)
123 : o(g), next(0), prev(0)
128 QDeclarativeGuardImpl::QDeclarativeGuardImpl(const QDeclarativeGuardImpl &g)
129 : o(g.o), next(0), prev(0)
134 QDeclarativeGuardImpl::~QDeclarativeGuardImpl()
136 if (prev) remGuard();
140 void QDeclarativeGuardImpl::addGuard()
144 if (QObjectPrivate::get(o)->wasDeleted)
147 QDeclarativeData *data = QDeclarativeData::get(o, true);
149 if (next) next->prev = &next;
151 prev = &data->guards;
154 void QDeclarativeGuardImpl::remGuard()
158 if (next) next->prev = prev;
165 QDeclarativeGuard<T>::QDeclarativeGuard()
170 QDeclarativeGuard<T>::QDeclarativeGuard(T *g)
171 : QDeclarativeGuardImpl(g)
176 QDeclarativeGuard<T>::QDeclarativeGuard(const QDeclarativeGuard<T> &g)
177 : QDeclarativeGuardImpl(g)
182 QDeclarativeGuard<T>::~QDeclarativeGuard()
187 QDeclarativeGuard<T> &QDeclarativeGuard<T>::operator=(const QDeclarativeGuard<T> &g)
189 setObject(g.object());
194 QDeclarativeGuard<T> &QDeclarativeGuard<T>::operator=(T *g)
201 T *QDeclarativeGuard<T>::object() const
203 return static_cast<T *>(o);
207 void QDeclarativeGuard<T>::setObject(T *g)
210 if (prev) remGuard();
218 #endif // QDECLARATIVEGUARD_P_H